This module takes a list of CSS files and concatenates them, making sure
to honor any valid @import statements included in the files.

Following the CSS 2.1 spec, @import statements must be the first rules
in a CSS file. Media-specific @import statements will be honored by
enclosing the included file in an @media rule. This has the side effect
of actually *improving* compatibility in Internet Explorer, which
ignores media-specific @import rules but understands @media rules.

It is possible that future versions will include methods to compact
whitespace and other parts of the CSS itself, but this functionality is
not supported at the current time.
